Fabrication of Z-scheme photocatalyst, Er3+:Y3Al5O12@NiGa2O4-MWCNTs-WO3, and visible-light photocatalytic activity for degradation of organic pollutant with simultaneous hydrogen evolution

Liang Tang, Jing Wang, Xudong Liu, Xiaoqing Shu, Zhaohong Zhang and Jun Wang

Renewable Energy, 2019, vol. 138, issue C, 474-488

Abstract: Three new visible-light-induced Z-scheme photocatalytic systems, Er3+:Y3Al5O12@NiGa2O4-WO3, Er3+:Y3Al5O12@NiGa2O4-MWCNTs (10–20 nm)-WO3 and Er3+:Y3Al5O12@NiGa2O4-MWCNTs (40–60 nm)-WO3, are successfully prepared via hydrothermal method. The prepared photocatalysts are characterized by X-ray diffractometer (XRD), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared (FT-IR) and photoluminescence (PL) spectra. UV–vis absorption and PL spectra were also determined to explore luminescence effect of the Er3+:Y3Al5O12. The photocatalytic activities of prepared photocatalysts are evaluated and compared under simulated solar-light irradiation in degradation of organic pollutant with simultaneous hydrogen evolution. The influence factors such as simulated solar-light irradiation time and photocatalyst amount on the photocatalytic activities of prepared photocatalysts are investigated. The results show that the Er3+:Y3Al5O12@NiGa2O4-MWCNTs (40–60 nm)-WO3 is the best one of three prepared photocatalysts in the degradation of methylene blue with simultaneous hydrogen evolution under simulated solar-light irradiation. In addition, the Er3+:Y3Al5O12@NiGa2O4-MWCNTs (40–60 nm)-WO3 also displays high performance in five repeated experiments. At last, the process of photocatalytic degradation of organic pollutant with simultaneous hydrogen evolution caused by Er3+:Y3Al5O12@NiGa2O4-MWCNTs (40–60 nm)-WO3 is proposed.

Keywords: Up-conversion luminescence agent (Er3+:Y3Al5O12); Z-scheme photocatalyst (NiGa2O4-WO3); Multi-walled carbon nanotubes (MWCNTs); Simulated solar-light irradiation; Photocatalytic degradation simultaneous hydrogen evolution (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:138:y:2019:i:c:p:474-488

DOI: 10.1016/j.renene.2019.01.113

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